Build & test in nix-shell

Add note on overriding `pkgs.haskell.packages.${compiler}` #283

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Run time

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Job	Run time
build_init (ubuntu-22.04)	22m 29s
build_init (ubuntu-20.04)	22m 4s
build_init (macos-13)	36m 39s
build_init (macos-14)	34m 28s
	1h 55m 40s